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Property, plant and equipment and construction in progress | 12 Months Ended
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Dec. 31, 2019
Property, plant and equipment and construction in progress |
Property, plant and equipment and construction in progress | 8. Property, plant and equipment and construction in progress
|  | December 31,
|  | 2019 |  | 2018
Land |  | $ | 3,566,537 |  | $ | 3,435,361
Buildings |  |  | 23,176,106 |  |  | 19,829,575
Plant and equipment |  |  | 64,840,636 |  |  | 61,777,836
Distribution system |  |  | 36,538,614 |  |  | 36,057,078
Office furniture, fixtures and equipment |  |  | 3,061,315 |  |  | 3,635,184
Vehicles |  |  | 1,582,053 |  |  | 1,431,719
Leasehold improvements |  |  | 272,092 |  |  | 244,221
Lab equipment |  |  | 14,958 |  |  | 27,795
|  |  | 133,052,311 |  |  | 126,438,769
Less accumulated depreciation |  |  | 71,803,332 |  |  | 67,557,951
Property, plant and equipment, net |  | $ | 61,248,979 |  | $ | 58,880,818
Construction in progress |  | $ | 1,335,597 |  | $ | 6,015,043
As of December 31, 2019, the Company had outstanding capital commitments of $226,526. The Company maintains insurance for loss or damage to all fixed assets that it deems susceptible to loss. The Company does not insure its underground distribution system as the Company considers the possibility of material loss or damage to this system to be remote. During the years ended December 31, 2019 and 2018, $7,755,375 and $14,398,624, respectively, of construction in progress was placed in service. Depreciation expense was $6,186,627 and $5,514,881 for the years ended December 31, 2019 and 2018, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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